Re: Asynchronous echo server - C / C++ / MFC Discussion Boards

Hi,

I am using a CTreeCtrl control in my application with a Single root node and having severla item.
I want when the CTreeCtrl is displayed the root should be intially be already expanded.

Please tell how to achieve it.

Thanks In Advance.

Dhiraj

what about reading some documentation??
Does CTreeCtrl::Expand[^] help?

Regards,
Sandip.

Hi! I am asked to code an asynchronous non-blocking echo server in C++ that compiles in both Windows and Unix platforms. Having no background in networking, I don't know where to start. Any help would be appreciated. Thank you.

Does this[^] help?

Regards,
Sandip.

Thanks! I have background in C++ but don't have any background in network programming. Can I ask for a tutorial on how to begin coding my project? Any help would be appreciated. Thanks!

modified on Monday, October 20, 2008 10:37 AM

gamzi wrote:
Can I ask for a tutorial

The link page previously provided to you has a "Tutorials" link too!

It is a crappy thing, but it's life -^ Carlo Pallini

Additional to what Sandi said, here are two good resources to start at:

Beej's Guide to Network Programming (OS independent)[^]
Winsock Programmer's FAQ[^] ... gives an echo server example.

Hope it helps Smile | :)

/M

My webchat in Europe Java | [Coffee]

Hi! I found this code under the boost c++ libraries. I also read that it is platform independent. Here's the code:

#include < cstdlib>
#include < iostream>
#include < boost/bind.hpp>
#include < boost/asio.hpp>

using boost::asio::ip::tcp;

class session
{
public:
session(boost::asio::io_service& io_service)
: socket_(io_service)
{
}

tcp::socket& socket()
{
return socket_;
}

void start()
{
socket_.async_read_some(boost::asio::buffer(data_, max_length),
boost::bind(&session::handle_read, this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
}

void handle_read(const boost::system::error_code& error,
size_t bytes_transferred)
{
if (!error)
{
boost::asio::async_write(socket_,
boost::asio::buffer(data_, bytes_transferred),
boost::bind(&session::handle_write, this,
boost::asio::placeholders::error));
}
else
{
delete this;
}
}

void handle_write(const boost::system::error_code& error)
{
if (!error)
{
socket_.async_read_some(boost::asio::buffer(data_, max_length),
boost::bind(&session::handle_read, this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
}
else
{
delete this;
}
}

private:
tcp::socket socket_;
enum { max_length = 1024 };
char data_[max_length];
};

class server
{
public:
server(boost::asio::io_service& io_service, short port)
: io_service_(io_service),
acceptor_(io_service, tcp::endpoint(tcp::v4(), port))
{
session* new_session = new session(io_service_);
acceptor_.async_accept(new_session->socket(),
boost::bind(&server::handle_accept, this, new_session,
boost::asio::placeholders::error));
}

void handle_accept(session* new_session,
const boost::system::error_code& error)
{
if (!error)
{
new_session->start();
new_session = new session(io_service_);
acceptor_.async_accept(new_session->socket(),
boost::bind(&server::handle_accept, this, new_session,
boost::asio::placeholders::error));
}
else
{
delete new_session;
}
}

private:
boost::asio::io_service& io_service_;
tcp::acceptor acceptor_;
};

int main(int argc, char* argv[])
{
try
{
if (argc != 2)
{
std::cerr << "Usage: async_tcp_echo_server <port>\n";
return 1;
}

boost::asio::io_service io_service;

using namespace std; // For atoi.
server s(io_service, atoi(argv[1]));

io_service.run();
}
catch (std::exception& e)
{
std::cerr << "Exception: " << e.what() << "\n";
}

return 0;
}

I'm having a hard time understanding this code. Can someone familiar with this code help me out in understanding how the code works? Really sorry because I'm not really familiar with network programming. Thank you.

I am not clear as to whether you always need to declare a session class to be able to use asynchronous read and write functions? And also I'm not really that clear about the flow of the program. Thank you and any help would be appreciated.

Hello ppl,

I have been trying to add Flex Grid to my MFC application in VS 2005. Dead | X|

Actually I have added the ocx control but I cannot create it's class. Frown | :(

When I enter Object Browser and choose fles grid ocx and click Add Reference button it gives me an error that the ocx is not in my reference path. WTF | :WTF:

How do I create it's h and cpp file of ocx and use it in my MFC application? Confused | :confused:

Thanx....

modified on Tuesday, October 21, 2008 4:38 AM

Hi All!

I'm creating a project and i'd like someone to tell me a way to change multiple controls properties
(ie: Enable, Display, Change texts ...) whenever i click on different tree items.

Is it ok to use EnumChildWindows?
Or is there any other method?

Thanks for any reply!

Dennis L wrote:
Is it ok to use EnumChildWindows?

It depends on your requirement.
If you want to modify less number of controls you can add the control variables for these controls and use them.
EnumChildWindows will enumerate all the child controls which might not be efficient if your dialog has huge number of controls and you need to alter only 4-5.

BTW: Use some relevant title for your post.. "Hi All" does not relate to your query in anyway.

Regards,
Sandip.

Hello everyone,

I am learning how to use WinHttp to do .Net Passport based authentication. I read a couple of documents, like this,

http://msdn.microsoft.com/en-us/library/aa384067.aspx[^]

my question is I want to find some external web site to do more testing, i.e. to request to access some Url, and if supply with the correct .Net Passport credential, the authentication will pass, if not the authentication will not pass. My confusion is I tried some ones, but seems are all Http Forms based authentication.

Could anyone suggest some web sites?

thanks in advance,
George

I need to have a dialog and a doc/view and be able to communicate between both. I've started this by creating a project with both the doc/view & dialog in it, and then including the headers of the doc/view in the dialog project. I've loaded a dialog from a dialog as shown below:

PortFrm Dlg(CWnd::FromHandle(m_hWnd));
Dlg.DoModal();

I need to do the same with a document/view project. The furthest I've gotten is to call the exe file of the document/view, but that makes inter-communication difficult. Any suggestions are welcome. Thank you in Advance!

Mark Gilson wrote:
I need to do the same with a document/view project.

If you have an SDI or MDI project, you can do the same.